Multiple choice

Which of the following statements is incorrect?

  1. +2 and +3 oxidation states are more common for the elements in 3d series.

  2. Atomic sizes of elements in 4d series are much smaller than those of the corresponding members in 5d series.

  3. The melting and boiling points of the elements in 3d series are lower than those of corresponding members in the 4d and 5d series.

  4. The enthalpies of atomisation of the elements in 3d series are lower than those of corresponding members in the 4d and 5d series.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Atomic sizes of elements in 4d series are virtually the same as those of the corresponding members in the 5d series. This is because of lanthanide contraction.

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